Seyitoglu et al. (2000) described their interpretation, based on a single fault surface and rockfall avalanche deposits previously mapped as a W-vergent thrust klippen above the Neogene successions in the Hancili Basin, that in central Anatolia there was a single extensional basin throughout the Miocene - Early Pliocene. It was later fragmented by a structural high of Neo-Tethyan ophiolitic basement bounded by an E-vergent thrust fault in the east along the western margin of the Cankiri Basin and a west-dipping normal fault in the west along the eastern margin of the Hancili Basin, into two sub-basins - Cankiri and Hancili basins - subsequent to the activity along the Kirikkale-Erbaa splay of the North Anatolian Fault Zone in the Late Pliocene (Fig. 1b). They also concluded that the crustal extension commenced in the Early Miocene and continued until the Early Pliocene without a break. They further claimed that their contention is supported by the recent works of Kaymakci (2000) and Kaymakciet al. (2000).